Porth, OliverChatterjee, KoushikNarayan, Ramesh2019-05-162019-05-162019-04-11Oliver Porth, et.al, The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project, 2019, https://arxiv.org/pdf/1904.04923.pdfhttp://hdl.handle.net/11603/13879Oliver Porth, Koushik Chatterjee, Ramesh Narayan, Charles F. Gammie, Yosuke Mizuno, Peter Anninos, John G. Baker, Matteo Bugli, Chi-kwan Chan, Jordy Davelaar, Luca Del Zanna, Zachariah B. Etienne, P. Chris Fragile, Bernard J. Kelly, Matthew Liska, Sera Markoff, Jonathan C. McKinney, Bhupendra Mishra, Scott C. Noble, Hector Olivares, Ben Prather, Luciano Rezzolla, Benjamin R. Ryan, James M. Stone, Niccolo Tomei, Christopher J. White, and Ziri Younsi | Kazunori Akiyama, Antxon Alberdi, Walter Alef, Keiichi Asada, Rebecca Azulay , Anne-Kathrin Baczko, David Ball, Mislav Balokovi c John Barrett, Dan Bintley, Lindy Blackburn Wilfred Boland, Katherine L. Bouman , Geoffrey C. Bower, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden Silke Britzen, Avery E. Broderick , Dominique Broguiere, Thomas Bronzwaer, Do-Young Byun, John E. Carlstrom, Andrew Chael , Shami Chatterjee, Ming-Tang Chen, Yongjun Chen (H ) Ilje Cho Pierre Christian John E. Conway, James M. Cordes, Geoffrey, B. Crew, Yuzhu Cui Mariafelicia De Laurentis , Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Sheperd S. Doeleman Ralph P. Eatough, Heino Falcke, Vincent L. Fish, Ed Fomalont, Raquel Fraga-Encinas, Bill Freeman Per Friberg, Christian M. Fromm, Jos e L. G omez, Peter Galison , Charles F. Gammie, Roberto Garc a, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi Roman Gold, Minfeng Gu , Mark Gurwell, Kazuhiro Hada Michael H. Hecht, Ronald Hesper, Luis C. Ho (UPq ) Paul Ho, Mareki Honma Chih-Wei L. Huang, Lei Huang (ÄÊ ) David H. Hughes, Shiro Ikeda , Makoto Inoue, Sara Issaoun, David J. James Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Michael D. Johnson Svetlana Jorstad Taehyun Jung Mansour Karami Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Jae-Young Kim, Junhan Kim, Jongsoo Kim, Motoki Kino Jun Yi Koay, Patrick, M. Koch, Shoko Koyama, Michael Kramer, Carsten Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Tod R. Lauer, Sang-Sung Lee, Yan-Rong Li, Zhiyuan Li , Michael Lindqvist, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo Andrei P. Lobanov, Laurent Loinard Colin Lonsdale, Ru-Sen Lu , Nicholas R. MacDonald, Jirong Mao , Daniel P. Marrone, Alan P. Marscher, Iv an Mart -Vidal Satoki Matsushita, Lynn D. Matthews, Lia Medeiros Karl M. Menten, Izumi Mizuno, James M. Moran Kotaro Moriyama, Monika Moscibrodzka, Cornelia Mu ller Hiroshi Nagai Neil M. Nagar, Masanori Nakamura, Gopal Narayanan, Iniyan Natarajan, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Hiroki Okino Gisela N. Ortiz-Le on, Tomoaki Oyama, Feryal Ozel, Daniel C. M. Palumbo Nimesh Patel, Ue-Li Pen, Dominic W. Pesce Vincent Pi, Richard Plambeck, Aleksandar PopStefanija, Jorge A. Preciado-L opez, Dimitrios Psaltis, Hung-Yi Pu, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Kazi L.J. Rygl, Salvador S anchez, David S anchez-Arguelles, , Mahito Sasada, , Tuomas Savolainen, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao Zhiqiang Shen, Des Small, Bong Won Sohn , Jason SooHoo, Fumie Tazaki, Paul Tiede Remo P.J. Tilanus , Michael Titus, Kenji Toma, , Pablo Torne, , Tyler Trent, Sascha Trippe, Shuichiro Tsuda, Ilse van Bemmel, Huib Jan van Langevelde Daniel R. van Rossum, Jan Wagner, John Wardle, Jonathan Weintroub Norbert Wex, Robert Wharton, Maciek Wielgus George N. Wong, Qingwen Wu , Ken Young, Andr e Young, Feng Yuan, Ye-Fei Yuan , J. Anton Zensus, Guangyao Zhao, Shan-Shan Zhao and Ziyan ZhuRecent developments in compact object astrophysics, especially the discovery of merging neutron stars by LIGO, the imaging of the black hole in M87 by the Event Horizon Telescope (EHT) and high precision astrometry of the Galactic Center at close to the event horizon scale by the GRAVITY experiment motivate the development of numerical source models that solve the equations of general relativistic magnetohydrodynamics (GRMHD). Here we compare GRMHD solutions for the evolution of a magnetized accretion flow where turbulence is promoted by the magnetorotational instability from a set of nine GRMHD codes: Athena++, BHAC, Cosmos++, ECHO, H-AMR, iharm3D, HARM-Noble, IllinoisGRMHD and KORAL. Agreement between the codes improves as resolution increases, as measured by a consistently applied, specially developed set of code performance metrics. We conclude that the community of GRMHD codes is mature, capable, and consistent on these test problems.51 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.numerical methodsmagnetohydrodynamics (MHD)magnetic fieldsgeneral relativityblack hole physicsText